( m ) 
Appearance will be vifible (for want of knowing 
which, the Satellite may be Immerged fome time be- 
fore it is miffed, and Emerged before it is difcovered) 
but will prevent them from taking one Satellite for 
another. 
And firft, the Obferver muff take Notice, that from 
the Time of the Conjunction of Jupiter with the 
Sun, which happened the beginning of September laft 
to the Time of the Oppofition which will happen 
in the middle of March next, the Eclipfes in general 
will be vifible on the Weftern Side, or on the Right 
Hand of Jupiter , when viewed in the Heavens, and 
at the Time of the firft Quadrature, which will hap. 
pen about the middle of next December , the firft Sa- 
tellite will immerge into the Shadow of Jupiter's 
Body at the Diftance of two Semidiameters of Jupi- 
ter , nearly from the Center of his Body : The fecond 
Satellite will immerge at the Diftance of two Semi, 
diameters and an half, the third Satellite at the Di- 
ftance of three Semidiameters and a quarter. And as 
the Earth haftensto the Oppofition, which will hap- 
pen in the middle of next March , the Diftance of 
each Satellite , at the Time of the Eclipfe from the 
Body of Jupiter , will grow lefs and lef?, till when 
the Earth arrives at the Oppofition, the Satellite will 
immerge clofe to the Limb of Jupiter ; and this Di- 
minution or Decreafe of Diftance will be fo regular, 
that the Spectator, by allowing for the proportionable 
Part of Time between the Quadrature and the Oppo- 
fition or Conjunction ( the Diftances of the Sa- 
tellites from the Body of Jupiter at equal Diftances 
from thefe Points being the fame) I fay, by thefe 
P i Means 
